July 26, 1918.

THE COLLIERY GUARDIAN.

165

By Tests The Best

RESULT OF LATEST TRIAL

INCREASE
IN
EVAPORATION

“PERFECTA” BOILER CIRCULATOR Ltd., 39, Victoria Street, LONDON, S.W. 1

“SINGLE HOOD”

AIR COMPRESSORS

Standard Types up to
5,000 c. ft. per min.

Fitted with special light
weight valves, forced
lubrication and
thorough intercooling
arrangements.

Special Types for Air
and Gas storage at
high pressures up to
6,000 lb. per square
inch.

I

15

1

t
' > 1

MAKERS
also of

High-Speed

STEAM ENGINES,
STEAM TURBINES,

High and Low Lift

Centrifugal Pumps,

AND

FANS for all purposes.



PETER BROTHERHOOD LTD.,

MANCHESTER : Mansfield Chambers, Q ET E D D A D fi 11P U GLASGOW: R. HENDERSON,
St. Ann’s Square. | E I EllD U NU U UIII	48, West Regent Street.